Dial pin for a watch



I 11, 197.0 KATSUHIKO MORITA 3,523,417

DIAL PIN FOR A WATCH Filed June 13, 1969 FIG./

' /c 4 /b E' 2 I 1 "11/4 f 1 1'. I rufl United States Patent Oflice3,523,417 Patented Aug. 11, 1970 3,523,417 DIAL PIN FOR A WATCHKatsuhiko Morita, Tokyo, Japan, assignor to Kabushiki Kaisha DainiSeikosha, Tokyo, Japan Filed June 13, 1969, Ser. No. 833,054 Claimspriority, application Japan, June 29, 1968, 43/ 54,764 Int. Cl. G04b19/06 US. Cl. 58127 2 Claims ABSTRACT OF THE DISCLOSURE This inventionrelates to a dial pin for fixing a watch dial to the plate easily andsurely.

The fixing of the dial is ordinarily ensured by the construction whereinthe point of the dial screw or the conical part of flush screw head inthe tapped hole drilled in the side of the plate locks the dial foot.

However, this construction heretofore used, has the disadvantage thatafter a long use or a slight shock the dial screw becomes loose, thedial loosens, and the dial screw drops into the movement and stops it.

This invention is directed to the remedy of these di advantages.

An object of this invention is the provision of a dial pin which can fixthe dial easier and surer by using an eccentric pin instead of screw.

The invention will be better understood from the following descriptiontaken in connection with the accompanying drawings in which:

FIG. 1 is a plan view of embodiment of this invention.

FIG. 2 is a sectional view, taken along the line A-A' of FIG. 1.

Referring now to the drawings, 1 denotes the dial pin, comprising a thincylindric portion 1a, a truncated conical collar portion 1b to engage atthe dial foot 4 and a head portion 1c provided with a slot. The dial 3is provided with dial foot 4. In said dial pin 1, the thin cylindricportion 1a and the collar portion 1b are eccentric and the center ofrotation of the dial pin 1 is that of the thin cylindric portion 1. Thethin cylindric portion 1a of said dial pin 1 tightly fits within anaperture in the plate 2, said tight fit permitting the rotation of saiddial pin 1. The fitting of the cylindric portion 1a within the aperturein the plate scarcely changes after rotation of said dial pin, due tothe elastic effect of the cylindric portion 1a which forms a thincylinder having center hole 1d.

Cir

OPERATION OF DIAL PIN When setting of dial 3 on the plate 2, the collarportion 1b of the dial pin 1 is maintained away from the dial foot 4 asshown in FIG. 1 by a two-dot chain line. After setting the dial on theplate 2, the dial pin 1 is turned and thecollar portion 1b is driveninto the dial foot 4, as shown in full line in FIG. 1 and in FIG. '2. Asthe dial pin 1 is provided with a slot in the head portion 10, said dialpin can be easily turned by a screwdriver. When so positioned, the forceof the dial pin 1, in resisting the loosening of the dial 3 from plate2, acts the direction whereof the dial pin is maintained against theplate. In addition, the dial pin 1 has an elasticity which tends toresist the turning of said dial pin 1 due to the loosening thereof.

According to the present invention, the fitting of the said dial on theplate is easily achieved. Further, the loosening of the dial, theloosening of the dial pin and falling out of the said pin will notoccur. Moreover, as there is no necessity for thread cutting, said pincan be manufactured at low cost.

I claim:

1. A dial pin for a watch having a plate formed with a pair of spacedfirst and second apertures therein and a dial having a foot extendingthrough a first of said apertures, said dial pin comprising a cylindricportion formed with a bore therethrough defining a tubular cross sectiondimensioned for snug receipt within said second plate aperture; and ahead portion having a collar portion projecting radially outwardly fromsaid cylindric portion and eccentrically disposed relative to saidcylindric portion, said collar portion being tapered inwardly from theside thereof adjacent said cylindric portion, said collar portion beingdimensioned so that one peripheral region thereof is engageable againstsaid dial foot when said cylindric portion and said dial foot arepositioned respectively in said first and second plate apertures andanother peripheral portion thereof is not so engageable when saidcylindric portion and dial foot are so positioned.

2. A dial pin as recited in claim 1, wherein said collar portion isfrusto-conical, with the base thereof of greater diameter being adjacentsaid cylindric portion.

References Cited UNITED STATES PATENTS 77,267 4/1918 Switzerland.

STEPHEN I. TOMSKY, Primary Examiner O S. A. WAL, Assistant Examiner

